Radio loud-speaking apparatus



Jan. 14, 1930. KENT 1,743,145

RADIO LOUD SPEAKING APPARATUS Filed Nov. 14, 1924 5 Sheets-Sheet l IN VEN TOR.

xi ATTORNEY.

Jan. 14, 1930. A. A. KENT V RADIO LOUD SPEAKING APPARATUS Filed Nov. 14, 1924 5 Sheets-Sheet IN VEN TOR. M M Ali M Q/Q @221 41 ATTORNEY.

Patented Jan. 14, 1930 UNITED STATES ARTHUR ATWATER KENT, F ARDMORE, PENNSYLVANIA RADIO LOUD-SPEAKING ArPARA'rUs Application filed November 14, 1924.' Serial No. 749,824.

My invention relates to loud speaking or amplifying telephonic receiving apparatus, and to such apparatus in combination with apparatus for receiving electrical energy, and more particularly high frequency electrical energy transmitted through the natural media, as in radio systems, or transmitted over an artificial conductor or conductors extending between transmitting and receiving stations.

In accordance with my invention, the loud speaking or amplifying telephonic apparatus comprises telephonic apparatus for converting sound-representing electric current into sound waves in combination with a plurality of amplifying horn structures.

Further in accordance with my invention, loud speaking or amplifying telephonic apparatus is disposed in assembly with receivi11 apparatus in a cabinet or housing in such re ation that one or more walls of the housing or cabinet is or are utilized as a wall or .walls of an amplifying horn structure of the loud speaking apparatus; further in such relation that a wall of the horn structure constitutes a partition within the cabinet or housing beween thereeeiving apparatus and the horn structure; and further in such relation that a movable Wall or cover of the cabinet or housing serves as a member for reflecting sound emanating from the horn structure.

My invention resides in apparatus of the character hereinafter described and claimed. For an illustration of some of the various forms my apparatus may take reference is to be had to the accompanying drawings in which:

Fig. l is a top plan view of an apparatus in accordance with my invention with the cover structure raised or removed.

Fig. 2 is a vertical sectional view, partly in elevation, taken on the line 2-2 of Fig. 1.

Fig. 3 is a perspective View of the apparatus shown in Figs. 1 and 2.

Fig. 4 is a vertical cross sectional view, partly in elevation of the entire cabinet taken on a plane indicated by the line 4& of Fig. 2.

Fig. 5 is a vertical cross sectional view,

partly in elevation, of the entire cabinet taken on a plane indicated by the line 5-5 of Fig. 2.

Fig. 6 is a vertical sectional View, partly in elevation, of the entire cabinet taken on a plane indicated by the line 66 of Fig. 2.

Fig. 7 is a fragmentary vertical sectional view, partly in elevation, taken on the-line 77 of Fig. 2.

Fig. 8 is a longitudinal vertical sectional view, partly in elevation, of a modified structure.

Fig. 9 is a. fragmentary vertical cross sectional .view, on smaller scale, taken on the line 9-9 of Fig. 8.

Fig. 10 is a longitudinal vertical sectional view, partly in'eleVa-tion, of a further modification.

Fig. 11 is a fragmentary vertical sectional view, on smaller scale, taken on the line 11 11 of Fig. 10.

Referring to Figs. 1 to 7 inclusive, the cabinet or housing comprises the bottom 1, back 2 and end walls 3 and 4, of wood or similar material, suitably secured to each other. The

front wall 5, of sheet metal or other suitable ''5 material, is secured by screws 6 to the horizontally extending frame members or strips 7 and 8.

Forming a longitudinally extending wall or partition within the cabinet is the downwardly and rearwardly extending board, plate or member 9, upon which there is hinged at 10 the inner cover or closure member 11 resting at its forward end upon the longitudinally extending strip 12.

Hinged at 13 upon the rear wall 2 is the outer cover or closure member 14 adapted to overlie the inner cover member 11 and to constitute in addition a sound-reflecting member, as hereinafter adverted to.

Within the front housing chamber formed between the members 5 and 9 is disposed the receiving apparatus, which in the example illustrated is radio receiving apparatus. It may comprise the coil 15 for coupling the antenna or other absorption structure to the input circuit of a radio frequency amplifying vacuum tube or audion, the socket for which is indicated at 16 supported upon the base member 17-secured upon the ledge or receiving audio frequency amplifying tubes. 1

flange 18, of sheet metal. or other material,

cuit of the first stage tube held in the socket 16. With the input circuit of the second tube is associated a variable condenser 0 operable from the exterior by the knob 23.

The output circuit of the second stage tube is coupled by the transformer 24 to the input circuit of the detector tube, for which is provided the socket 25 carried upon the base 26 secured to the member 18. In the input circuit of the detector tube is provided a tuning condenser C whose rotatable element is operated by the exterior knob 27 Upon the base 26 are additional sockets 28 and 29 for The input circuitof the first audio frequency amplifier tube is coupled to the output circuit of the detector through the audio frequency transformer 30 carried upon the base 26.

The output circuit of the first audio frequency amplifying tube is coupled to the input circuit of the second by the audio frequency transformer 31 carried upon the base 26, and the output circuit of the second audio frequency amplifier tube is connected by the telephone cord 32 with the loud speaker telephone instrument T. Carried upon the exterior of the wall 5 are the switch 33, for varying the degree of coupling between antenna and the input circuit of the first tube, and the rheostat structure 34 comprising the rheostat knobs 35 and 36 controlling resistances in the circuitsof the filaments of two or more of the vacuum tubes. Associated with this last named structure is a switch 37 controlling connection of a source of current, not shown, with the filaments of the tubes.

The loud speaking structure comprises the aforesaid instrument T associated with a plurality of horns, as H and H The instrument T may be of any suitable type for converting sound-representing current into sound waves. Generally it comprises a pair of magnets 38 co-acting with a diaphragm D.

In the example villustrated, the magnets 38 are carried upon the cap 39, generally of insulating material, threaded upon the casing 40, generally of metal, in which the diaphragm D is suitably held. In the example illustrated, the casing 40 is threaded into the the end of the horn tube 41, of metal or other suitable material, which has a sound passage increasing in cross section with distance from the. diaphragm D. In the example illustrated. the tube 41 divides-into two branches 42 and 43 communicating, respectively, with or formingpart .ofthe horn passages H and .H. The tube structure 41, 42, 43 may restupon the bottom member land be secured to any part of the structure, as, for example,

to the rear wall 2, as by screws 44. The .tube 41 may be provided with a lug 45 adapted to engage the rear wall 2'for steadying or positioning the tube structure.

Each of the horn passages or chambers H and H beyond the ends of the tubes 42 and 43 is formed in, part by the block 46,

of wood or other suitable material, having a flat rear faceengaging against the rear wall '2 and secured thereto by screws 47. Each of the blocks 46 upon its front side slants downwardly and rearwardly in a flat face bearing against the rear flat face of the partition member 9,-"and is secured thereto by screws 48. Each 'of the horn passages H and H is bounded adjacent the ends of the tubes 42 and 43 by the lower side of the block 46 and the bottom board or member 1. Each of the horn passages H and H is further formed by a block 49, of wood or other suitable material, secured .inthe angle-between the bottom 1 and each of the end walls 3 and 4, and secured in place b screws 50. The i passage may further be ormed in part b blocks 51, of wood or other suitable materia secured by screws 52 to the members 2 and 9 and disposed adjacent the upper edges of the members 3 and 4. The horn passages H and H from the diaphragm D outwardly extend downwardly, then toward opposite ends of the housing, then upwardly and then converge toward each other at their open ends or outlets, with which co-acts the cover.

member 14, which is held in inclined position by suitable link structure 53 pivoted at 54 to the member 14 and co-acting with a pin 55 secured upon a face of one of the blocks v 46. A dog 57 pivoted upon the link member 53 serves automatically to lock and unlock the link 53 with respect to the pin 55, so that by merely manipulatin the cover 14 it may be lowered to closed pos1tion', or may be raised and locked in open position. i

The sound waves emanating from the sound passages H and H and as instituted by the diaphragm D, impinge upon the upwardly and forwardly inclined cover member 14, and are reflected toward the front.

And due to the convergence towards each other of the outlets of the sound passages away from the ends of the housing and member 14, toward the middle or center thereof,

the effectiveness of sound reflection outwardly and forwardly is enhanced.

The member 9 may at its middle be cut away to form the recess 58 to accommodate the instrument T.

In'Figs. 8 and 9 there is illustrated a loud speaker structure in general the same as that hereinbefore described. In this case, howex er, sheet metal members 46, secured to 01.

between the members 2 and 9, replace the blocks or members 46, and sheet metal members 59 replace the members 49 and 51.

In Figs. 10 and 11 a generally similar arrangement is shown, except that the tubes 42 and 43 are prolonged and extend toward the ends of the housing and then upwardly, where they communicate with horn bell structure comprising members 51 and 46", the latter engaging 01' supported at one end by the tubular members 42 and 43 and at their other ends terminating at blocks 46.

In both the arrangements of Figs. 8 to 11 inclusive the members 46", 59, 46 and 51 are disposed between the inclined or slanting wall 9 and the rear wall 2.

In both arrangements the pin 55, co-acting with the link 53, is carried upon a portion of the horn-forming structure, 9. depending extension 46 in Fig. 8, and the member 46 in %Vhat I claim is: p

1. Amplifying telephonic apparatus comprising a plurality of horn structures forming horn passages cooperatively related to a diaphragm, said horn passages converging toward each other at their outlets, and a sound-reflecting member adapted to reflect the entire volume of sound from said horn passages disposed adjacent the outlets of said passages and toward which they converge.

2. In combination, a housing, a partition in said housing on one side of which receiving apparatus is disposed, a wall on the opposite side of said partition spaced therefrom, and structure between said wall and partition and formingtherewith a horn passage, and a plane reflecting member adjacent the outlet of said passage.

3. In combination, a housing, a partition in said honsing on one side of which receiving apparatus is disposed, a protective cover for said apparatus, a wall on the opposite side of said partition spaced therefrom, structure between said wall and partition and forming therewith a horn passage, and a cover for said housing cooperating with said first cover to reflect and amplify sound emanating from the outlet of said horn passage.

4. In combination, a housing, a partition in said housing dividing it into compartments in one of which is disposed receiving apparatus, and structure disposed in another of said compartments forming a plurality of horn passages, the axes of said horn passages being in one plane and extending downwardly in said compartment from said apparatus and thence toward the ends thereof and upwardly therein, said structure including means for deflecting the sound from the opposite edges of the housing and converging it at the center.

5. In combination, a housing, a partition therein dividing it into compartments, one of said compartments having a normally closed cover, structure disposed between said partition and a wall of said housing forming with .said wall, partition and bottom a horn passage, and a second cover coacting with said first cover to form an extension of said passage for reflecting and amplifying sound waves.

6. Amplifying apparatus comprising a passage leading from receiving apparatus, and a plurality of horn structures forming horn passages leading from said first-named passage, the axes of said horn passages convergingtoward each other at their outlets, and being in substantially the same plane as the axis of said first-named passage.

7 Amplifying apparatus comprising a plurality of horn structures forming horn passages cooperatively related to a diaphragm, and a sound deflecting member for each structure mounted on the outer edge thereof at the outlet of the respective horn passage for converging sound waves issuing from said passages.

8. The combination with a housing comprising wall members spaced with respect to each other, of amplifying apparatus comprising means disposed between said wall members to form therewith a plurality of horn passages increasing in cross section to their outlets, deflecting means mounted on said wall members adjacent the outlets of said passages for effecting convergence of sound waves issuing from said passages, and a sound-reflecting member against which the converging sound waves are directed.

ARTHUR ATWATER KENT. 

